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Viessmann: DHW pump into Boiler not into the indirect?
I have recently installed a Viessmann Vitodens 200 with an indirect. I already piped the DHW pump to pump into the indirect and the pair are working just fine. After re-reading the installation manual, I just noticed on EVERY layout diagram, it's labeled "IMPORTANT: DHW circulating pump must pump into Vitodens 200-W WB2B boiler (as illustrated)".
I have always piped to pump into the "indirect" but Viessmann wants to pump into the "boiler" instead and it's a "must"? Does anyone know why?
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